Dean was an original member of the Billy Elliot London cast, and then ended up taking over the lead in 2009, sticking around until 2011. He’ll be appearing in the GoT episode directed by David Benioff and D.B. Weiss, which is episode 3!

We HAVE to assume it's a talking role, we mean, people know who he is. The source speculates like this:

'He could be one of the younger men who turn up in Night’s Watch scenes. There are also two notable roles in A Storm of Swords that we have yet to see cast that Chapman would be age-appropriate for- Edric Storm and Edric Dayne. To date, we’ve had no confirmation that either character will be in season 3. If Edric Dayne is appearing, it seems likely he would show up before episode 3, based on the first episode synopsis. There is no mention of the Dragonstone characters in the synopsis, which could fit with Chapman not appearing until episode 3.'

In other words… WE DON'T KNOW!

It's not like this news was needed to clinch our viewership — we totes are gonna watch this shizz anyway! So scandalous! SO FAB!!